https://bugs.gentoo.org/show_bug.cgi?id=345987
--- Tk-804.029/pTk/Xlib.h
+++ Tk-804.029/pTk/Xlib.h
@@ -1,6 +1,7 @@
 #ifndef _XLIB
 #define _XLIB
 #ifndef _XLIB_H_
+#ifndef _X11_XLIB_H_
 extern XFontStruct *XLoadQueryFont  _ANSI_ARGS_((Display *, const char *));
 extern XModifierKeymap *XGetModifierMapping  _ANSI_ARGS_((Display *));
 extern XImage *XCreateImage  _ANSI_ARGS_((Display *, Visual *, unsigned int, int, int, char *, unsigned int, unsigned int, int, int));
@@ -143,6 +144,7 @@
 extern Window XGetSelectionOwner _ANSI_ARGS_((Display *, Atom));
 extern int XRectInRegion _ANSI_ARGS_((Region,int,int,unsigned,unsigned));
 extern int XSubtractRegion _ANSI_ARGS_((Region, Region, Region));
+#endif /* _X11_XLIB_H_ */
 #endif /* _XLIB_H_ */
 extern int _XInitImageFuncPtrs _ANSI_ARGS_((XImage *image));
 #endif /* _XLIB */
